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Replacement Lock For UPVC Door Locks It is possible to replace your uPVC door locks out of convenience or necessity like after a burglary or the loss of your keys. It might cost you a bit to employ a locksmith but the security that comes with professional installation is worth it. Lock Cylinder The lock cylinder is the component of the locking system that allows you to open and close your door. It comes with a keyhole and a slot in which you insert the key. The cylinder is surrounded by a case to protect